Water and sewage bill
Calculate your water and wastewater bill from meter consumption in cubic metres (m³) and local utility tariffs.
Open calculatorSeptic tank pump-out
Calculates how often a closed sewage holding tank (cesspool / szambo) needs to be pumped out and the annual cost of vacuum-truck visits. Enter water consumption either from household size and daily litres per person or from your average monthly water-meter reading (converted as 12 months ÷ 365 days). An optional percentage of water that does not enter the tank (such as garden irrigation) reduces sewage inflow, and the target fill level sets the usable volume per pump-out.
Total holding tank volume in cubic metres (1 m³ = 1,000 litres), e.g. 8, 10 or 12 m³.
m³
Estimate from household members and daily litres per person, or enter average monthly m³ from your water meter.
Number of people living in the home and using the plumbing daily.
Example value to check: 100 l/person/day (typical household use ranges from 80 to 150 l/day).
L/d
Share of water used outdoors (e.g. garden watering) that does not flow into the holding tank. Leave at 0% if all water enters the tank.
%
Example threshold (e.g. 90%): leaving a 10% buffer gives 1–2 days of margin before the vacuum truck arrives.
%
Example price to check and replace with the quote from your local vacuum-tanker service — depends on tank volume and distance.
Pump-out needed every
22.5 days
Daily sewage inflow
400 l (0.4 m³)
Usable volume per pump-out
9 m³
Pump-outs per year
16.2
Annual pump-out cost
4,055.56 PLN
Average monthly cost
337.96 PLN
Effective cost per 1 m³
27.78 PLN/m³
Default values (100 l/person/day, 90% fill threshold, 250 per pump-out) are illustrative examples — verify them against your water meter and local waste-hauler rates.
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Frequently asked questions
How do you calculate how many days a holding tank lasts between pump-outs?
First compute the usable volume at your order threshold (for example, 10 m³ × 90% = 9 m³, or 9,000 litres). Divide that usable volume by daily wastewater inflow (e.g. 4 residents × 100 L/day = 400 L/day), which gives 9,000 ÷ 400 = 22.5 days between pump-outs.
Why order a pump-out at 85–90% full instead of 100%?
Vacuum-tanker operators typically schedule pickups 1–3 working days ahead. Ordering when the tank reaches around 90% leaves a safety buffer so the household can keep using water without overflowing the tank before the truck arrives.
How should I account for garden watering?
If you use total consumption from your main water meter, enter the estimated share of water used outdoors (e.g. 15–25% in summer) in the excluded-water field. If you enter indoor per-person use or already have a separate garden sub-meter, keep the excluded share at 0%.
What holding tank size suits a family of four?
At 100 litres per person per day, four people generate about 12 m³ of wastewater per month. A 10 m³ tank filled to 90% (9 m³ usable) needs emptying roughly every three weeks. It is also best to match the usable tank volume to the capacity of local vacuum trucks.
Where do I find the price of a single pump-out?
Pump-out prices vary by municipality, tanker capacity and distance to the wastewater treatment plant. The default number in the calculator is only an example to check — replace it with the quote from a licensed local hauler.
Educational estimate only. Not medical, tax, legal or financial advice.